package com.linkstec.gtjakettle;

import org.pentaho.di.core.KettleEnvironment;
import org.pentaho.di.core.database.DatabaseMeta;
import org.pentaho.di.core.exception.KettleXMLException;
import org.pentaho.di.core.plugins.PluginRegistry;
import org.pentaho.di.core.plugins.StepPluginType;
import org.pentaho.di.repository.LongObjectId;
import org.pentaho.di.repository.RepositoryDirectoryInterface;
import org.pentaho.di.repository.kdr.KettleDatabaseRepository;
import org.pentaho.di.repository.kdr.KettleDatabaseRepositoryMeta;
import org.pentaho.di.trans.TransHopMeta;
import org.pentaho.di.trans.TransMeta;
import org.pentaho.di.trans.step.StepMeta;
import org.pentaho.di.trans.steps.insertupdate.InsertUpdateMeta;
import org.pentaho.di.trans.steps.tableinput.TableInputMeta;
/**
 * 
 * @author lyl
 *
 */
public class TransDemo {
	 public static TransDemo transDemo;
	
	 /**
	  * 两个库中的表名
	  */
	 public static String from_tablename = "USERSA";
	 public static String to_tablename = "USERSB";
	 
	/**
	 * 数据库连接信息,适用于DatabaseMeta其中 一个构造器DatabaseMeta(String xml)
	 */
	 public static final String[] databasesXML = {
	        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
	          "<connection>" +
	            "<name>km</name>" +
//	            "<server>192.168.10.130</server>" +
	            "<server>10.189.144.51</server>" +
	            "<type>Oracle</type>" +
	            "<access>Native</access>" + 
	            "<database>GTJA</database>" +
	            "<port>1521</port>" +
	            "<username>mot</username>" +
	            "<password>gtjamot</password>" +
	          "</connection>",
	          "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
	          "<connection>" +
	            "<name>kettle</name>" +
	            "<server>10.189.144.51</server>" +
	            "<type>Oracle</type>" +
	            "<access>Native</access>" + 
	            "<database>GTJA</database>" +
	            "<port>1521</port>" +
	            "<username>mot</username>" +
	            "<password>gtjamot</password>" +
	          "</connection>"
	    };	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			KettleEnvironment.init();
			transDemo = new TransDemo();
			TransMeta transMeta = transDemo.generateMyOwnTrans();
//			String transXml = transMeta.getXML();
			//System.out.println("transXml:"+transXml);
//			String transName = "etl/update_insert_Trans.ktr";
//			File file = new File(transName);
//			FileUtils.writeStringToFile(file, transXml, "UTF-8");
			
			KettleEnvironment.init(); 
	        //创建DB资源库 
	        KettleDatabaseRepository repository=new KettleDatabaseRepository(); 
	        DatabaseMeta databaseMeta=new DatabaseMeta("144.51","Oracle","Native(JDBC)",
	        		"10.189.144.51","GTJA","1521","km","km");
	        //选择资源库 
	        KettleDatabaseRepositoryMeta kettleDatabaseRepositoryMeta =
	        		new KettleDatabaseRepositoryMeta("144.51","km","Transformation description",databaseMeta); 
	        repository.init(kettleDatabaseRepositoryMeta); 
	        // 连接资源库 
	        repository.connect("admin","admin");
	        RepositoryDirectoryInterface directoryInterface=repository.loadRepositoryDirectoryTree(); 
	        transMeta.setRepositoryDirectory(directoryInterface);
	        LongObjectId longObjectId = new LongObjectId(111);
	        transMeta.setObjectId(longObjectId);
	        // 保存进资源库
	        repository.save(transMeta, "test");
			
		//	System.out.println(databasesXML.length+"\n"+databasesXML[0]+"\n"+databasesXML[1]);
		} catch (Exception e) {
			e.printStackTrace();
			return;
		}
		
	}
	
	/**
	 * 生成一个转化,把一个数据库中的数据转移到另一个数据库中,只有两个步骤,第一个是表输入,第二个是表插入与更新操作
	 * @return
	 * @throws KettleXMLException 
	 */
	public TransMeta generateMyOwnTrans() throws KettleXMLException{
		
		System.out.println("************start to generate my own transformation***********");
		
		TransMeta transMeta = new TransMeta();
		
		//设置转化的名称 
		transMeta.setName("insert_update");
		
		//添加转换的数据库连接
        for (int i=0;i<databasesXML.length;i++){
            DatabaseMeta databaseMeta = new DatabaseMeta(databasesXML[i]);
            transMeta.addDatabase(databaseMeta);
        }
		
		//registry是给每个步骤生成一个标识Id用
		PluginRegistry registry = PluginRegistry.getInstance();
		
		//******************************************************************
		
		//第一个表输入步骤(TableInputMeta)
		TableInputMeta tableInput = new TableInputMeta();
		String tableInputPluginId = registry.getPluginId(StepPluginType.class, tableInput);
		//给表输入添加一个DatabaseMeta连接数据库
		DatabaseMeta database_bjdt = transMeta.findDatabase("kettle");
		tableInput.setDatabaseMeta(database_bjdt);
		String select_sql = "SELECT ID, USERID, USERNAME FROM "+from_tablename;
		tableInput.setSQL(select_sql);
		
		//添加TableInputMeta到转换中
		StepMeta tableInputMetaStep = new StepMeta(tableInputPluginId,"table input",tableInput);
		
		//给步骤添加在spoon工具中的显示位置
		tableInputMetaStep.setDraw(true);
		tableInputMetaStep.setLocation(100, 100);
		
		transMeta.addStep(tableInputMetaStep);
		//******************************************************************
		
		//******************************************************************
		//第二个步骤插入与更新
		InsertUpdateMeta insertUpdateMeta = new InsertUpdateMeta();
		String insertUpdateMetaPluginId = registry.getPluginId(StepPluginType.class,insertUpdateMeta);
		//添加数据库连接
		DatabaseMeta database_kettle = transMeta.findDatabase("km");
		insertUpdateMeta.setDatabaseMeta(database_kettle);
		//设置操作的表
		insertUpdateMeta.setTableName(to_tablename);
		
		//设置用来查询的关键字
		insertUpdateMeta.setKeyLookup(new String[]{"USERID"});
		insertUpdateMeta.setKeyStream(new String[]{"USERID"});
		insertUpdateMeta.setKeyStream2(new String[]{""});//一定要加上
		insertUpdateMeta.setKeyCondition(new String[]{"="});
		
		//设置要更新的字段
		String[] updatelookup = {"ID","USERID","USERNAME"};
 		String [] updateStream = {"ID","USERID","USERNAME"};
 		Boolean[] updateOrNot = {false,true,true};
 		insertUpdateMeta.setUpdateLookup(updatelookup);
		insertUpdateMeta.setUpdateStream(updateStream);
		insertUpdateMeta.setUpdate(updateOrNot);
		String[] lookup = insertUpdateMeta.getUpdateLookup();
		System.out.println("******:"+lookup[1]);
		//System.out.println("insertUpdateMetaXMl:"+insertUpdateMeta.getXML());
		//添加步骤到转换中
		StepMeta insertUpdateStep = new StepMeta(insertUpdateMetaPluginId,"insert_update",insertUpdateMeta);
		insertUpdateStep.setDraw(true);
		insertUpdateStep.setLocation(250,100);
		transMeta.addStep(insertUpdateStep);
		//******************************************************************
		
		//******************************************************************
		//添加hop把两个步骤关联起来
		transMeta.addTransHop(new TransHopMeta(tableInputMetaStep, insertUpdateStep));
		System.out.println("***********the end************");
		return transMeta;
	}
}

